566 6 st Seville. (Dr. A. Bidz.) Lord LUford (p). 95. 3. 3. 22. 6, 9. SeviUe, Spain. Lord Lilford (p). 11. 1.1.108-109. 1. Coto Doiiana, Huelva. A. Chapman (c&p). 0.5.10.1. 2(5. Jerez, Cadiz. A. Chapman (o&p). 8.3.26.1-2. Genus DYROMYS Thomas. 1780. Myoxus Zimmermann, Geogr. Gesch., ii, p. 351 (part). 1857. Eliomys Blasius, Saugethiere Deutschlands, p. 288 (Sub-genus of Myoxus) part. 1890. Myoxus Reuvens, Die Myoxidae oder Schlaefer, p. 24 (Sub-genus of Myoxus) part. 1906. Dryomys Thomas, Proc. Zool. Soc, London, 1905. ii, p. 345, April 5, 1906 (Sub-genus of Eliomys). Not of Philippi, An. Mus. Nae. de ChUe, xiv, p. 20, 1900. 1907. Dyromys Thomas, Ann. and Mag. Nat. Hist., 7th ser., xx, p. 406, November, 190'? (Substitute for Dryomys). Type.—Mus nitedula Pallas. Geographical distribution.—From central Asia through Asia Minor to Hungary and eastern Switzerland. Characters.—Teeth resembling those of Eliomys but relatively smaller than in any of the other European members of the family, the crowns with concavity less pronounced than in Eliomys and cross-ridges better developed, the first intermediate ridge in the upper molars nearly complete and scarcely lower than the others ; three rudimentary ridges intercalated between the main ridges of m^, m^ and m^ ; outer border of crowns of upper molars with two high main cusps nearly as well developed as in Eliomys, these usually supplemented by a minute anterior or posterior cusp ; lower molars with outer cusps relatively lower than in Eliomys and sub-equal in size, inner cusps essentially as in the related genus ; premolars both above and below with crowns sub-quadrate in outline, nearly flat, the cusps obsolete, the maxillary tooth crossed by four or five ridges, the anterior of which are better developed than in Eliomys. Skull essentially as in Eliomys, but parietals as broad as in Muscardinus; the angular process of mandible fenestrate. Externally difiiering from Eliom.ys in the uniformly haired, distichous tail. Bemarks.—Though nearly related to Eliomys this group seems worthy of recognition as a genus. Seven forms are known, four of which (three of them apparently local races of one species) occur in Europe. KEY TO THE EUROPEAN PORMS OP DYBOMYS. Skull broad and robust, the zygomatic breadth about 17 mm.; auditory buUas decidedly enlarged (Rustschuk, Bul¬ garia) D. robustus, p. 572. Skull slender, the zygomatic breadth about 15 mm.; auditory buUse not specially enlarged D. nitedula, p. 567.